Nozzle for duodenal pump tubes



Jan. 29, ,1946. C. DE PQAGUIAR 2,393,728

ANozzmi: Fon` DUODENAL PUMP TUBES Filed Sept. 23, 1944 I i W1 i v l '4INVENTQR CLovls de Paw@ Aguiar mgmwi .A'rroRNEm Patented Jan. 2,9, 1946UNITED" STATE s PATaNror Fics In Brazil October 19, 1943 3 claims.(omas-276) The present invention relates to improvements in the nozzlesof apparatus for the pump treatment of sinuous organic channels and,more particularly, in nozzles or tips for duodenal pump tubes. L

In my U. S. Patent 2,356,659, issued on August 22, 1944, I havedescribed a tip for a duodenal pump tube which is so constructed thatliquid pumped through the tube emerges from rearwardly directed openingsprovided in the tip in order to propel the tip and the attached tube ina forward direction through the duodenal channel.

I have found that in a device of the type set forth in my prior patentthe most satisfactory propelling eiiect is obtained if Ythecross-section of the rearwardly directed outflow openings provided inthe tip is kept comparatively small so that the liquid is caused toemerge 4lromthe tip in the form of thin jets of great velocity. When thetip has reached the desired position in the duodenal channel, it ispossible to inject through such small openings a suiiicient quantity ofliquid by forcing the liquid under suitable pressure through the tubeand tip. However, difficulties have been encountered if it is desired touse a tube having a tip with small openings for the removal of liquidfrom the duodenal or any other organic cavity by suction, because, inthis case, strong suction forces act on very limited areas instead of adesirable more uniform suction force actingvonalarger area.'v Y l 5 Oneobject of the present invention is to overcome this disadvantage and toprovide an apparatus for the pump treatment if sinuous organic channelswhich can be used with equal efficiency for the propulsion of the tipand tube through the organic channel and the injection of liquidsthrough the tip into the organic channel and also for the removal ofliquids from the channel by suction. y

Another object of the invention is to provide a duodenal pump tubeincluding a tip with a rearwardly directed outiiow opening of variablecrosssection. LA further object of the invention is to provide anapparatus for the pump treatment of sinuous organic channels including atube and a tip with a rearwardly directed iiow passage in which thecross-section of the ow passage is automatically reduced when liquid ispumped through the tube and tip and hence out through -the passage,whereas the cross-sectional area of the flow passage is automaticallyrestored to its normal larger size when liquid is sucked through the tipinto the tube.

A stili further object of the; invention is t0 provide a tipof thetypeset forth'whichcan be easily manufactured, assembled,` r.taken apart,`cleaned and reassembled and to which the tube can be attached in asimple manner. Y

According to the invention, Iaccomplish these objects by the arrangementandcombination of parts set forth in the following 4detaileddescrip--tion, deiinedin the appended claims and illustra,-1 tively exemplifiedin the accompanying drawing inwhichrf .v'

Fig. 1 is a side elevation of a tip according to the present inventionwith the attached end of the tube. v v v Fig..2 is an axial sectionthrough the tip with-l outthe tube. f j K Figs. 3 and flare Vsectionssimilar torthat of Fig. 2, but with the tube attached to the tip andshowing two different operative positions, respectively.

Fig. 5 is a perspective ofthetip. Y

Fig. 6 is an exploded perspective view of the tip without the tubeholder. n

Fig. '7 is aseparate perspective view of the tube vView of` the coverportionV` holder and n Fig. 8 is an exploded perspective vi-ew of thetip with the wall of the lowertip portion `partly broken away toshow theinserted tube holder.

The tip according to the present invention com-` prises a cup shapedrear :portion II having a come` paratively large cavity I2 provided withan internal screw thread I3 adjacent its upper edge and with an annularshoulder I4 a short distance below the screw thread I3. An axial bore I5 having a diameter exceeding the normal outer diameter of the elastictube I6 in its not distended condition permits passing of the end of thetube I6 from the outside` into the cavity I2. The difference between thediameter of the bore I5 and the normal diameter of the tube I6 is suchthat the concentric flow passage I5a formed between the bore I5 and thetube I6 in its distended condition has a cross-sectional area smallerthan the inner cross-sectional area of the tube I6. The end of the tubeIG is fixed in the cavity I2v by means of a tube holder (see Fig. 7)which consists of a short tubular element I1 of an outer diameterapproximately equal to that of the tube I6 in its normal not distendedcondition said tubular element I1 being provided with annular groovesI8. At its upper edge, the tubular element Il is formed with three flatuniformly spaced radial projections I9 which seat on the shoulder I4when the tube holder is inserted into the cavity I2.

When the tip is assembled with the tube, the tube I6V is passed throughthe bore I5 untilvits end emerges from the cavity VI2 to a suicientextent to permit freeY manipulation thereof, and this end is thenpushed, outside of the cavity I2,

\ vonto the tubular element I1 on which it is re- Ytained byfrictionaugmented by the grooves I8. AIf necessary, additional precautions maybe taken to ,secure theattachment of thetubetolhe Lube holder.Tii'enathe tube le is puueagbeek through the boreV I5 until theprojections' I9 fthetubula liquidlfrom the inner end of the tube I6toward element I'I are seated on the annular flange I4, Y,

of the cavity I2.

The cavity I2 is closed by means ofthe cover which is shaped to formwith the rear,-portion Il a smooth bulb-shaped unit having a roundedscrew-thread 2| which screws'into theinternal screw-thread I3 of the cupVshaped portion I'I'.'

The innerfaceiofifthe cover=20 isforrned'with a rearwardlypointingffdeector surface, which, when the cover hasbeen screwed'home,has its apex 22ldisposed2in alignment with the axis of the tip nearthe-inner endof the inlet passage formed byy thejtube I6 andtubularVelement I1,

saiddeflector surface including concave Walls 23v to vguide the liquidemergingv from the Vtub smoothly toward the annular' passage 15a.

Y The Adevice operatesas follows: When liquid isY pumped through thetube I6 into the tip cavity I2,V

the pump pressure, aided bythe smaller'V flow cross-sectionof thepassage I5a as compared' to that of the tube I6. acts on the wallportion' of the YelasticY tube |61 disposed in the bore I5 todis-y tendthis wall portion',-as shown in Fig':4,'thereby decreasing the' size ofthe ilowl passage V15a' and causing the liquidto emerge from the tip inthe for-m of a thin'walled cylindrical jet'of considerable velocitywhich exerts a comparatively large propelling force oriv theftip.y f fWhen the pump action is discontinuedl andffor l instance, a suctionforce is applied to-tl'ieV tube I6,

the wall portion of the latterin the bore I5` returns to itsoriginal'size zCsee Fig. 3) andthe crosssection of the annular passageI5a is accordingly enlarged, thus facilitating thesucking of liquidthrough thetip intothetube. I

It w'illfbev noticed that `the spaced` projections I9 of the tubular.relement I1 iwhichisupport the latter .inthe' cavity-:I2-d'o not impedethe ow kof the passage I5avor vice versa to any noticeable extent. v

I claim:

1. In an apparatusl Vfor the pump treatment of Vsinuous organicchannels, the combination with an elastic tube of a tip comprisinga'bulb shaped bodyV having a rounded forward end and being providedwithA an internal cavity of, supstantial i Yfnffcl ch the e'd of 'saidube passes into said cavity, said bore having a diameter exceeding thenormal outer diameter of said tube `VYVin' the not distended conditionof the latter so as front end. Along its peripheral"edgvejthelcover.;v20 is recessedv and providedV with anV externaltoleave between said boreand tube an annular iiow passage, and means for holding the inner endof-said;tube.1in said'fcavity so as to permit the free -owbf liquidbetween the yinner end ofthe f tube and said annular flow passage,whereby the Vfull cross-'section of said flow passage is availablefor-zliquid; :suckedv` therethrough -into Vsaid cavity and hence-fintothe tube while the cross-sectional t area of 'said annulariflowapassageis reduced :due tothe distentioniof thewall portion of said-tube locatedin said Vbore when .liquid is 'pumped throughthe tube.v into said'cavityand out through said'low passageV f 2.,-An apparatus,r as,t claimedainlclaim Y1, in which the frontwall `of said cavity opposite said bore-'isprovided with? a rearwardly pointingdeflector surface having its apexin'align'ment with the axisr offthe tip and Vin 'cluding concave wallsto guide liquid vemerging fromA the tube into said cavity`smoothly'towards said annular flow pas-l y sage, said tubeandtube-holding means cooperatingtoform an axial inlet passage leading intosaid,` cavity tor a point'near the apex of said de- 3.' 'app'aratu`s,`as- .claimedfinY-claim l; in whichvv said tip includes a' rear portionprovided with; af 'cup-'shapedcavity having at 'a distance fromits 'rim'an inwardly projecting annular shoulder anda removable cover shaped toform with said -rearportion-asmooth bulb-shaped unit, Y

and said tubeholdingmeans includes av short tubular ,elementaxiallyVarranged in said Ycavity and havingther inner end of said 'elastic tubemounted thereon; said tubular element being pro# videdatiit's-`:Erontenr i wthspacedredial preme-Y tions-to seat-onsaidannularshoulder., j u* l Q. r CLOVISVDEQI? 'i A AGUIAR.

